Balanced stream-line rudder



Aug. 26, 1930.

G. VAN ALLER BALANGED STREAM LINE RUDDER Filed Nov. 18, 19,29

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Patented Aug. 26, 1930 PATENT CFFICE ,Y

GIJSBERT VAN ALLER, OF ROTTERDAM, NETHERLANDS BALANCED STREAM-LINE RUDDER Application filed November 18, 1.929, Serial No. 408,134, and in Germany June 1, 1929.

The mounting and removal of a balanced stream line rudder as is known presents considerable difficulties which so far have been partly overcome only by a comparatively eX- pensive and unsatisfactory rudder construction.

`he invention which relates to a balanced stream line rudder connected by means of pivots at its upper and lower ends to the vessel, for example to the stern post, resides in this ythat the rudder body is formed or provided near itstop at its front side with a recess which is filled by an easily removable member in one or more parts continuing the profile of the rudder and is Aso dimensioned that the rudder after removal of this member can be lifted to a sutlicient extent to allow it to be removed either rearwardly or laterally.

One embodiment of the invention is illus* trated in the accompanying drawing' in Fig. 1 in side elevation lpartly in vertical section, while Fig, 2 is a section on the line H--II of Fig.V 1, Fig. 3 showing` the profile of the rudder.

As shown in the drawing' the balanced rudder formingin known manner a sufliciently stiifened hollow body 4 has the now usual stream line form. At its upper and lower ends it is connected by short pivots 5 and 6 to thc propeller post 7. The upper pivot 5 which is secured to the rudder body extends into a bearing in the post and serves not only to guide the rudder laterally, but also to transfer the weight of the rudder to the post. rlhe lower pivot connected to the post serves merely as a lateral guide.

,The forward part of the rudder body 4,

ri. e. the part projecting into the C-shaped stern post is cut away near its top to such an extentthat the body 4 canbe raised until the pivot 5 is lifted clear of its bearing and the pivot 6 frees the rudder'and allows the latter to be removed if desired after uncoupling of the rudder stem.

The said recess in the rudder is normally filled by two easily removable wooden blocks 8 secured to the rudder body. For this purpose in the embodiment shown the rudder body is provided directly beneath the said recess at both sides with a step forming a rib 9 which serves to receive the bolts 10v or the like. holding together the blocks 8. The blocks 8 thus constitute a filling piece the walls of which sweep smoothly into those of the rudder body itself so that the stream line form of the rudder is retained over the full height. For the purpose of removingthe rudder body it is only necessary to remove the filling` piece and then proceed as above stated.V To lit the rudder body in position the operations are carried out in the reverse order.

It need hardly be mentioned that both rudder pivots may be secured to the rudder body and project into bearings in the post or vice versa. lt is also immaterial which pivot transfers the weight of the rudder body to the post. ylf desired both pivots could be used solely for lateral guiding purposes in which case the rudder stem may have within the vessel a bearing taking` up the weight of the rudder.

The filling' member 8 which at the same time prevents undue upward movement of the rudder body, while hanging' on its pivots, in relation to the ship` can obviously be of any material suitable for the purpose and for example might also be in one part. The method of attachment of the filling member is not partv of the invention. In using bolts it is preferable to lill the space around the nuts and the heads of the bolts with cement or the like. i

A balanced stream line rudder connected at its upper and lower sides by means of pivots to the vessel for example to the stern -post characterized in that the rudder body is provided near its top and at the front side with a recess .lled by an easily removable member continuing the profile of the rudder and in one or more parts, such recess being so dimensioned that on removal of said member the rudder may be raised sutliciently to allow itv to be removed rearwardly or llaterally. n

In testimony whereof I aiiix my signature.

GIJSBERT vAN ALLER. m0 

